1.

The value of the integral int(cos7x-cos8x)/(1+2cos5x)dx can be

Answer»

`(SIN2X)/(2)-(sin3x)/(3)+c`
`(SIN5X)/(5)-(cos5x)/(4)+c`
`(cosx)/(3)-(sin4x)/(2)+c`
none of these

Answer :A


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